Blast-pipe safety-valve.



No. 687,83I. v Patented Dec. 3, 190i.

' 4.L 0. CHARPENTIER.

BLAST PIPE SAFETY VALVE.

(Application filed Sept. 9, 1901.)

(No Model.)

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W/ T/VE SSE S .mi mums swans co., mmmuwo. WASHINGTON, n, c.

UNITED STATES PATENT OEETCE.

JOSEPH O. CHARPENTIER, OF CONCORD, NEW HAMPSHIRE.

BLAST-Pl PE SAFETY=VALVE.

SPECIFICATION forming part of Letters Patent No. 687,831, dated December3, 1901. Application tiled September 9, 1901. Serial No. 74,756. (Nomodel.)

To LZZ whom it may concern:

Beit known thatI, JOSEPH O. CHARPENTIER, a citizen of the United States,residing at Concord, in the county of Merrimack and State of NewHampshire, have invented certain new and useful Improvements inBlast-Pipe Safety-Valves; and I do declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame, reference being had to the accompanying drawings, and to theletters of reference marked thereon, which form a part of thisspecification.

This invention relates to improvements in, valves employed in connectionwith the blastpipe of a forge to afford an outlet for the forgegasesupon a diminution or cessation of the blast-pressure.

The nature of the invention will be readily comprehended, referencebeing had to the following detailed description and to the accompanyingdrawings, in which;-

Figure 1 is a view, partly in elevation and partly in section, of a pairof forges and a blast-pipe equipped with my improved valve. Fig. 2 is anenlarged vertical sectional view of the valve and casing.

Referring to the drawings by letter, A A denote the forges.

B is the blast-pipe, connected at one end with the blast-fan, (notshown,) and C is a pipe branching from the blast-pipe and provided atits lower end with branches c c, leading to the forge -furnacesObviously the blast-pipe may be extended, as shown, to supply otherforges. The blast-pipe is preferably above the forges, and the pipe C ispreferably vertically arranged. In vertical alinement with the pipe C isan opening in the blast-pipe, around which is secured a valve- 4 casingD, open at its top.

E is a removable section of the valve-casing, having` at its top aninwardly-extending flange e, providing a restricted opening e. Theflange has an upward inclination and is slightly curved, as shown moreclearly in Fig. 2. The section E tits the upper end of the to its seatagainst gravity action by the blastpressure.

In operation the air under pressure from the fan forces the valveupwardly against its seat thereb closiugtheo eninge, and asses by thepipe C to the forges. The valve is held to its seat as long as therequisite airpressure is maintained but upon the cessation or asuftlcient diminution of the pressure the valve drops by its own weightand uncovers the opening e, providing an outlet for the gases and foulair generated in the forges and which pass through the pipe C.

' The valve and its parts are arranged entirely within the casing, andwhen the valve is seated the casing is air-tight. It desired, agasket h,of felt or the like, may be employed to provide a yielding seat for thevalve.

I claim as my inventionl. In combination with a forge an air-blast pipeand a branch pipe depending trom the air-blast pipe and leading to theforge, an outlet in the blast-pipe opposite the branch pipe, a casingabout the outlet having an opening, and a gravity-valve in the casingadapted to be moved by the air-blast to close the opening.

2. In combination with a forge an air-blast pipe and a branch pipedepending from the air-blast pipe and leading to the forge, an outlet inthe blast-pipe opposite the branch pipe, a @asin g about the outlet, aremovable casingsection having at its top an inwardly-project ing flangeproviding a restricted opening, and a gravity-valve in the casingadapted to be moved by the air-blast to close the opening.

3. In combination with a forge an air-blast pipe and a branch pipedepending from the l and having a stem guided in the spiders, andair-blast pipe and leading to the forge, an outa gasket between the seatand Valve. Io let in the blast-pipe adjacent to the branch In testimonywhereof I affix my signature pipe, a casing about the outlet, aeasing-seeiu presence of two Witnesses.

tion removably secured to the easingand hav- JOSEPH O. CHARPENTIER.

ing at its top an inwardly-projecting curved Vtnesses:

flange providing a valve-seat, spiders Within GEO. YV. PRESCOTT,

the casing, a valve conforming to the flange FRED T. DUNLAP.

